Product: Samsung Plasma TV (PN51F5300)
Initial symptoms:
In-laws were downstairs watching tv when they heard a pop and the screen went out.
When resetting power and turning on again, front light blinks red a few seconds and goes out: tv is otherwise unresponsive until power is cycled again.
Initial investigation: Remove back from Plasma TV, armed with DMM.
No obvious capacitor bulging on any visible boards.
Power connected, turned on: green LED on main board repeats a pattern of short-long (1 second total) on, one second off. Repeats five times.
Power supply makes soft clicking sounds and high pitched tone when main board LED is lit, but stops when LED is off.
VS and VA test points vary during 5 startup attempts, neither getting higher than 1V - drop to 0 after startup attempts end.
Confirmed on main board that Standby (obviously), V15, and V5.3 are being generated.
Additional investigation: unseat cable between Power Supply board and X sustain from PS end.
Power connected, turned on: green LED blinks regularly, optical port turns on (red light visible).
At startup, Va max voltage is ~58V, but rapidly falls off. Vs max voltage is ~225, same falloff observed.
Va is near specified voltage (58V), but VA is high (specified as 209V).
Vs adjusted as low as trim allows, but only observed max voltage at turnon as 223V.
Any troubleshooting recommendations or initial diagnoses welcomed!
Initial symptoms:
In-laws were downstairs watching tv when they heard a pop and the screen went out.
When resetting power and turning on again, front light blinks red a few seconds and goes out: tv is otherwise unresponsive until power is cycled again.
Initial investigation: Remove back from Plasma TV, armed with DMM.
No obvious capacitor bulging on any visible boards.
Power connected, turned on: green LED on main board repeats a pattern of short-long (1 second total) on, one second off. Repeats five times.
Power supply makes soft clicking sounds and high pitched tone when main board LED is lit, but stops when LED is off.
VS and VA test points vary during 5 startup attempts, neither getting higher than 1V - drop to 0 after startup attempts end.
Confirmed on main board that Standby (obviously), V15, and V5.3 are being generated.
Additional investigation: unseat cable between Power Supply board and X sustain from PS end.
Power connected, turned on: green LED blinks regularly, optical port turns on (red light visible).
At startup, Va max voltage is ~58V, but rapidly falls off. Vs max voltage is ~225, same falloff observed.
Va is near specified voltage (58V), but VA is high (specified as 209V).
Vs adjusted as low as trim allows, but only observed max voltage at turnon as 223V.
Any troubleshooting recommendations or initial diagnoses welcomed!
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